This is still a problem in Natty. The only way I can get a microphone
working is to use a USB microphone.
Here is the output of cat /proc/interrupts:
CPU0
0: 63871825 IO-APIC-edge timer
1: 518132 IO-APIC-edge i8042
7: 1 IO-APIC-edge
8: 1 IO-APIC-edge rtc0
9: 67071 IO-APIC-fasteoi acpi
12: 34758412 IO-APIC-edge i8042
14: 0 IO-APIC-edge pata_atiixp
15: 0 IO-APIC-edge pata_atiixp
16: 832205085 IO-APIC-fasteoi ohci_hcd:usb3, ohci_hcd:usb4, ath9k,
hda_intel
17: 5980086 IO-APIC-fasteoi ehci_hcd:usb1
18: 15899014 IO-APIC-fasteoi ohci_hcd:usb5, ohci_hcd:usb6, radeon
19: 1446 IO-APIC-fasteoi ehci_hcd:usb2, hda_intel
22: 4779363 IO-APIC-fasteoi ahci
42: 1 PCI-MSI-edge eth0
NMI: 0 Non-maskable interrupts
LOC: 61586845 Local timer interrupts
SPU: 0 Spurious interrupts
PMI: 0 Performance monitoring interrupts
IWI: 0 IRQ work interrupts
RES: 0 Rescheduling interrupts
CAL: 0 Function call interrupts
TLB: 0 TLB shootdowns
TRM: 0 Thermal event interrupts
THR: 0 Threshold APIC interrupts
MCE: 0 Machine check exceptions
MCP: 846 Machine check polls
ERR: 1
MIS: 0
** Changed in: alsa-driver (Ubuntu)
Status: Expired => New
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https://bugs.launchpad.net/bugs/697383
Title:
[Realtek ALC259] Recording problem
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